Yes and No...
If you're referring to IVR and ACCESS channels - then that's exactly what you have - 8 ACCESS port for OPEN/END voice session, 9th caller would not get any voice service. Same goes for the 12 IVR channels, 13th caller would not get treatment, just silence.
Since you have 40 channel total and you split 20 out for the contact center - you have 20 left for normal voicemail users, the 21st caller would receive RNA until port become available.